Anything that isn't a load or store and anything that doesn't read the
CR can go as soon as its inputs are ready.
While we could also allow SPR read/write and carry read/write, we plan
to change them to be read in decode2 and written in writeback soon and
they will need separate hazard detection to be added.
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
Check GPRs against any writers in the pipeline.
All instructions are still marked single in pipeline at
this stage.
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
